zone 1 drops 1 apple but i dont know that zone one drop that, so a gray icon give me the hint that there is something i could get out so i can grind that zone ^^
Ah I see, this is a feature that is being worked on. I want there to be a sort of monster log, that lets you see the stats of enemies, where they are, what loot they drop, etc.
If you're willing to use something outside of the game, what you're looking for does exist! (Warning! Spoils loot drop locations.)
https://docs.google.com/spreadsheets/d/1-QynA3ZfWwRtnZU3pIr9Z-ZveClRylYZ-YEo4Az4MiM/edit?usp=sharing